Chapter 8 Viewing Voyager PSD Data

Changing If the precursor mass taken from the data file is not correct:

1.

Display the Segments tab (see Figure 8-2 on page 8-4)

 

 

by doing either of the following:

 

 

• In the PSD Calibration dialog box, click the

 

 

 

Segments tab

 

 

• From the Process menu, select PSD Processing

2.

Click Change Mass and enter a new mass to use for

 

 

calibration.

3.

Click OK.

4.

Click Plot to display the composite spectrum for the new

 

 

mass. The following occurs:

 

 

• A new composite spectrum is generated as

 

 

 

 

 

described in “How the composite spectrum is

8

 

 

generated” on page 8-6,and displayed.

 

• The PSD calibration for the data file is updated

 

 

 

with the new precursor ion mass.

 

 

• The new composite spectrum is displayed.

 

 

 

 

 

 

 

 

 

 

 

NOTE: The Max Stitch Masses displayed in the

 

 

 

PSD segment list in the PSD Processing dialog

 

 

 

box are not updated until you apply the new

 

 

 

calibration.

 

 

 

5.

To save the updated calibration information in the data file,

 

 

click Apply Precursor Mass.

8-24 Applied Biosystems